It's mostly you. You have to learn to scrunch up more.

Seriously, I can commiserate. Although I'm not tall, I am a lefty and often find myself fumbling with stuff made by righties.

I'm sure there are others here better suited to offer advice, but I'd say your stuck with shopping online at specialty retailers, like REI, where you can order gear in your size. Big Box stores stock for the largest target. Tall people and lefties aren't even on it.